Entropy generation analysis of a dual-height plate-fin heat sink with Nanofluid coolant applying two-phase mixture model.

In this work, the two-phase mixture model is applied to solve the velocity field, the pressure field and obtain the entropy generation rates in a dual-height plate-fin heatsink. The governing equations were solved using the second-order upwind discretization scheme as well as SIMPLE scheme used in coupling the pressure and velocity fields. The Re , nanoparticle concentration (ψ), secondary fin height (h sf), and fin spacing (d sf) were considered within the ranges of 500-2000, 0%-1%, 5 mm-17.5 mm, and 0.25 mm-0.5 mm, respectively. The results demonstrated that S ˙ t h almost decrease by 30% as h sf increases from 5 mm to 17.5 mm. The increase in h sf escalates S ˙ f r by 308% and 238% at Re numbers of 500 and 2000, respectively. In addition, the escalation of Re from 500 to 2000 increases S ˙ f r by 2125% and 1748% for h sf 5 mm and 17.5 mm, respectively. The fin spacing analysis revealed that the lowest S ˙ t h and highest S ˙ f r belong to d sf =0.5 mm. The lower the d sf the higher the backward flow and mixing flow at the heatsink outlet, thereby delay in flow passage and intensification of S ˙ t h and S ˙ f r. [ABSTRACT FROM AUTHOR]